Nexus 7

I live in Mexico. I have a Strong vpn open connection based in San Francisco. I have a wireless router that is set up to broadcast this connection. I have a Nexus 7 which recognizes the connection and when I do an ip search it recognizes that the signal is coming from San Francisco. I have disconnected all location services on the Nexus 7. My problem is that I cannot download or play purchased music or movies on the Nexus 7. I keep getting a message that it is not allowed in my country (Mexico). Can anyone tell me what to do? Please keep it simple.

Thanks in Advance